FreeBSD/Linux Kernel Cross Reference
sys/dev/random/hash.c

     /*-
      * Copyright (c) 2000-2004 Mark R V Murray
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer
     *    in this position and unchanged.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/8.4/sys/dev/random/hash.c 143418 2005-03-11 15:42:51Z ume $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    
    #include <crypto/rijndael/rijndael-api-fst.h>
    #include <crypto/sha2/sha2.h>
    
    #include <dev/random/hash.h>
    
    /* initialise the hash */
    void
    yarrow_hash_init(struct yarrowhash *context)
    {
            SHA256_Init(&context->sha);
    }
    
    /* iterate the hash */
    void
    yarrow_hash_iterate(struct yarrowhash *context, void *data, size_t size)
    {
            SHA256_Update(&context->sha, data, size);
    }
    
    /* Conclude by returning the hash in the supplied /buf/ which must be
     * KEYSIZE bytes long.
     */
    void
    yarrow_hash_finish(struct yarrowhash *context, void *buf)
    {
            SHA256_Final(buf, &context->sha);
    }
    
    /* Initialise the encryption routine by setting up the key schedule
     * from the supplied /data/ which must be KEYSIZE bytes of binary
     * data.
     */
    void
    yarrow_encrypt_init(struct yarrowkey *context, void *data)
    {
            rijndael_cipherInit(&context->cipher, MODE_CBC, NULL);
            rijndael_makeKey(&context->key, DIR_ENCRYPT, KEYSIZE*8, data);
    }
    
    /* Encrypt the supplied data using the key schedule preset in the context.
     * KEYSIZE bytes are encrypted from /d_in/ to /d_out/.
     */
    void
    yarrow_encrypt(struct yarrowkey *context, void *d_in, void *d_out)
    {
            rijndael_blockEncrypt(&context->cipher, &context->key, d_in,
                KEYSIZE*8, d_out);
    }

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